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      python-时间
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        <h2 id="python-时间"><a href="#python-时间" class="headerlink" title="python-时间"></a>python-时间</h2><ul>
<li><p>获取当前时间 </p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> datetime,time</span><br><span class="line"></span><br><span class="line">now = time.strftime(<span class="string">"%Y-%m-%d %H:%M:%S"</span>)</span><br><span class="line"><span class="keyword">print</span> (now)</span><br><span class="line"></span><br><span class="line">now = datetime.datetime.now()</span><br><span class="line"><span class="keyword">print</span> (now)</span><br><span class="line"></span><br><span class="line"><span class="comment"># 2019-10-31 15:01:10</span></span><br><span class="line"><span class="comment"># 2019-10-31 15:01:10.376455</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>获取当前时间前一小时、前一天、前一周、前一个月</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> datetime,time</span><br><span class="line"></span><br><span class="line">now = datetime.datetime.now()</span><br><span class="line"><span class="comment"># 前一小时</span></span><br><span class="line">d1 = now - datetime.timedelta(hours=<span class="number">1</span>)</span><br><span class="line"><span class="keyword">print</span> (d1.strftime(<span class="string">"%Y-%m-%d %H:%S:%M"</span>))</span><br><span class="line"></span><br><span class="line"><span class="comment"># 前一天</span></span><br><span class="line">d2 = now - datetime.timedelta(days=<span class="number">1</span>)</span><br><span class="line"><span class="keyword">print</span> (d2.strftime(<span class="string">"%Y-%m-%d %H:%S:%M"</span>))</span><br><span class="line"></span><br><span class="line"><span class="comment"># 上周日</span></span><br><span class="line">d3 = now - datetime.timedelta(days=now.isoweekday())</span><br><span class="line"><span class="keyword">print</span> (d3.strftime(<span class="string">"%Y-%m-%d %H:%S:%M"</span>), <span class="string">" "</span>, d3.isoweekday())</span><br><span class="line"></span><br><span class="line"><span class="comment"># 上周一</span></span><br><span class="line">d31 = d3 - datetime.timedelta(days=<span class="number">6</span>)</span><br><span class="line"><span class="keyword">print</span> (d31.strftime(<span class="string">"%Y-%m-%d %H:%S:%M"</span>), <span class="string">" "</span>, d31.isoweekday())</span><br><span class="line"></span><br><span class="line"><span class="comment"># 上个月最后一天</span></span><br><span class="line">d4 = now - datetime.timedelta(days=now.day)</span><br><span class="line"><span class="keyword">print</span> (d3.strftime(<span class="string">"%Y-%m-%d %H:%S:%M"</span>))</span><br><span class="line"></span><br><span class="line"><span class="comment"># 上个月第一天# </span></span><br><span class="line"><span class="keyword">print</span> (datetime.datetime(d4.year, d4.month, <span class="number">1</span>))</span><br><span class="line"></span><br><span class="line"><span class="comment"># 2019-10-31 14:08:04</span></span><br><span class="line"><span class="comment"># 2019-10-30 15:08:04</span></span><br><span class="line"><span class="comment"># 2019-10-27 15:08:04   </span></span><br><span class="line"><span class="comment"># 2019-10-21 15:08:04  </span></span><br><span class="line"><span class="comment"># 2019-10-27 15:08:04</span></span><br><span class="line"><span class="comment"># 2019-09-01 00:00:00</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>时间字符串转时间戳，时间戳转时间字符串，datetime对象转时间戳</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#</span><span class="bash"> 字符串时间转时间戳</span></span><br><span class="line">datestr1 = '2015-06-06 10:10:10'</span><br><span class="line">print 'datestr to time :', time.mktime(time.strptime(datestr1, "%Y-%m-%d %H:%M:%S"))</span><br><span class="line"></span><br><span class="line"><span class="meta">#</span><span class="bash"> 时间戳转格式化时间字符串</span></span><br><span class="line">time1 = time.time()</span><br><span class="line">print 'time to datestr :', time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time1))</span><br><span class="line"></span><br><span class="line"><span class="meta">#</span><span class="bash"> datetime对象转时间戳</span></span><br><span class="line">datetime1 = datetime.datetime.now()</span><br><span class="line">print 'datetime to time :', time.mktime(datetime1.timetuple())</span><br><span class="line"></span><br><span class="line"><span class="meta">#</span><span class="bash"> 时间戳转datetime对象</span></span><br><span class="line">t1 = time.time()</span><br><span class="line">t2 = t1 + 20</span><br><span class="line">d1 = datetime.datetime.fromtimestamp(t1)</span><br><span class="line">d2 = datetime.datetime.fromtimestamp(t2)</span><br><span class="line">print 'time1 to datetime1 :', datetime.datetime.fromtimestamp(t1)</span><br><span class="line">print 'time2 to datetime2 :', datetime.datetime.fromtimestamp(t2)</span><br><span class="line">print 'seconds diff :', (d2 - d1).seconds</span><br></pre></td></tr></table></figure>
</li>
<li><p>时间和日期格式化符号说明</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">%</span><span class="bash">y <span class="comment"># 两位数的年份表示（00-99）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">Y <span class="comment"># 四位数的年份表示（000-9999）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">m <span class="comment"># 月份（01-12）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">d <span class="comment"># 月内中的一天（0-31）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">H <span class="comment"># 24小时制小时数（0-23）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">I <span class="comment"># 12小时制小时数（01-12） </span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">M <span class="comment"># 分钟数（00=59）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">S <span class="comment"># 秒（00-59）</span></span></span><br><span class="line"> </span><br><span class="line"><span class="meta">%</span><span class="bash">a <span class="comment"># 本地简化星期名称</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">A <span class="comment"># 本地完整星期名称</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">b <span class="comment"># 本地简化的月份名称</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">B <span class="comment"># 本地完整的月份名称</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">c <span class="comment"># 本地相应的日期表示和时间表示</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">j <span class="comment"># 年内的一天（001-366）</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">p <span class="comment"># 本地A.M.或P.M.的等价符</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">U <span class="comment"># 一年中的星期数（00-53）星期天为星期的开始</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">w <span class="comment"># 星期（0-6），星期天为星期的开始</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">W <span class="comment"># 一年中的星期数（00-53）星期一为星期的开始</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">x <span class="comment"># 本地相应的日期表示</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">X <span class="comment"># 本地相应的时间表示</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">Z <span class="comment"># 当前时区的名称</span></span></span><br><span class="line"><span class="meta">%</span><span class="bash">% <span class="comment"># %号本身</span></span></span><br></pre></td></tr></table></figure></li>
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